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  <div id="layout-content"><div id="function.ceil" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">ceil</h1>
   <p class="verinfo">(PHP 4, PHP 5, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">ceil</span> &mdash; <span class="dc-title">进一法取整</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.ceil-description">
  <h3 class="title">说明</h3>
   <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>ceil</strong></span>(<span class="methodparam"><span class="type"><span class="type">int</span>|<span class="type">float</span></span> <code class="parameter">$num</code></span>): <span class="type">float</span></div>

  <p class="simpara">
   如果有必要，通过对 <code class="parameter">num</code> 向上取整返回下一个最高的整数。
  </p>
 </div>

 <div class="refsect1 parameters" id="refsect1-function.ceil-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    
     <dt>
<code class="parameter">num</code></dt>

     <dd>

      <p class="para">
       要进一法取整的值
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.ceil-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   返回不小于 <code class="parameter">num</code> 的下一个整数。<span class="function"><strong>ceil()</strong></span>
   返回的类型仍然是 <span class="type">float</span>，因为 <span class="type">float</span> 值的范围通常比 <span class="type">int</span> 要大。
  </p>
 </div>


 <div class="refsect1 changelog" id="refsect1-function.ceil-changelog">
  <h3 class="title">更新日志</h3>
  <table class="doctable informaltable">
   
    <thead>
     <tr>
      <th>版本</th>
      <th>说明</th>
     </tr>

    </thead>

    <tbody class="tbody">
     <tr>
      <td>8.0.0</td>
      <td>
       <code class="parameter">num</code> 不再接受支持数字转换的内部对象。
      </td>
     </tr>

    </tbody>
   
  </table>

 </div>


 <div class="refsect1 examples" id="refsect1-function.ceil-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-3085">
    <p><strong>示例 #1 <span class="function"><strong>ceil()</strong></span> 例子</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">ceil</span><span style="color: #007700">(</span><span style="color: #0000BB">4.3</span><span style="color: #007700">);&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;5<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">ceil</span><span style="color: #007700">(</span><span style="color: #0000BB">9.999</span><span style="color: #007700">);&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;10<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">ceil</span><span style="color: #007700">(-</span><span style="color: #0000BB">3.14</span><span style="color: #007700">);&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;-3<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>

 <div class="refsect1 seealso" id="refsect1-function.ceil-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.floor.html" class="function" rel="rdfs-seeAlso">floor()</a> - 舍去法取整</span></li>
    <li class="member"><span class="function"><a href="function.round.html" class="function" rel="rdfs-seeAlso">round()</a> - 对浮点数进行四舍五入</span></li>
   </ul>
  </p>
 </div>

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